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The effects of natural, forced and thermoelectric magnetohydrodynamic convection during the solidification of thin sample alloys

The effects of natural, forced and thermoelectric magnetohydrodynamic convection during the solidification of thin sample alloys

Kao, A. ORCID: 0000-0002-6430-2134, Shevchenko, N., Roshchupinka, O., Eckert, E. and Pericleous, K. ORCID: 0000-0002-7426-9999 (2015) The effects of natural, forced and thermoelectric magnetohydrodynamic convection during the solidification of thin sample alloys. In: IOP Conference Series: Materials Science and Engineering. IOP Publishing. ISSN 1757-8981 (Print), 1757-899X (Online) (doi:https://doi.org/10.1088/1757-899X/84/1/012018)

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Abstract

Using a fully coupled transient 3-dimensional numerical model, the effects of convection on the microstructural evolution of a thin sample of Ga-In25%wt. was predicted. The effects of natural convection, forced convection and thermoelectric magnetohydrodynamics were investigated numerically. A comparison of the numerical results is made to experimental results for natural convection and forced convection. In the case of natural convection, density variations within the liquid cause plumes of solute to be ejected into the bulk. When forced convection is applied observed effects include the suppression of solute plumes, preferential secondary arm growth and an increase in primary arm spacing. These effects were observed both numerically and experimentally. By applying an external magnetic field inter-dendritic flow is generated by thermoelectrically induced Lorentz forces, while bulk flow experiences an electromagnetic damping force. The former causes preferential secondary growth, while the latter slows the formation of solute plumes. This work highlights that the application of external forces can be a valuable tool for tailoring the microstructure and ultimately the macroscopic material properties.

Item Type: Conference Proceedings
Title of Proceedings: IOP Conference Series: Materials Science and Engineering
Additional Information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Uncontrolled Keywords: Ga-In Alloy, Convective Transport, Thin Sample Solidification
Faculty / Department / Research Group: Faculty of Architecture, Computing & Humanities
Faculty of Architecture, Computing & Humanities > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG)
Faculty of Architecture, Computing & Humanities > Department of Mathematical Sciences
Last Modified: 02 Mar 2019 15:53
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/14861

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